https://build.spring.io/browse/INT-SI50X-JOB1-56
We can't wait for the latch in the interruptable code flow;
we can't have a round-robing election guarantees.
* Add `Thread.sleep(LockRegistryLeaderInitiator.this.busyWaitMillis)`
to the `LockRegistryLeaderInitiator` when we restart the main task
* Remove latches waiting and thread shifting from the
`RedisLockRegistryLeaderInitiatorTests`
* Use long `busyWaitMillis` for yielding initiator to let the second
candidate to be elected
**Cherry-pick to 5.0.x**
(cherry picked from commit 081d0d1)
9d7fab7144